Preserve spaces when using fprintf with strcat to show variables, spaces and strings on screen to user

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Hi,
I have had a try at getting a string ending with a space to be preserved on screen using fprintf and strcat together but cannot preserve the spaces.
B=strcat(PR1,'.mat');
filey=B
% Y='.*2'
% if ~isempty(regexp(directory,Y))
% end
% *****************************
%%THIS PRODUCES A LIST OF ONLY THE MAT FILES
d=dir;
% d1=cellstr(d)
d1=struct2cell(d);
d2=d1(1,:);
d3=cellfun(@(x) regexp(x,'.mat'),d2,'uni',false);
d4=find(~cellfun('isempty', d3));
theMATfiles=d2(d4)'
natsort(theMATfiles)%download natsort function from file exchange
% pwd
k=1;
% for k = 1:20
% Create a mat filename, and load it into a structure called matData.
matFileName = sprintf('mat%d.mat',k);
% save(matFileName)
% load('matData.mat')
if exist(B, 'file')
A = load(filey);
fprintf(strcat('HURRAH!! File',{''},B,' does exist.\n'));
else
% fprintf('File %s does not exist.\n', matFileName);
fprintf(strcat('NOPE!! File','_',B,' does not exist.\n'));
end
I have tried placing a space e.g. {''} but it did not work, I get the following error:
Error using fprintf
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in mat_ides_03 (line 53)
fprintf(strcat('HURRAH!! File',{''},B,' does exist.\n'));
  4 Kommentare
Stephen23
Stephen23 am 12 Mai 2017
Bearbeitet: Stephen23 am 12 Mai 2017
"but it won't help me with the inserting spaces.."
I did not say that it would. I did say that natsortfiles is good for sorting filenames.
Stephen Devlin
Stephen Devlin am 17 Mai 2017
Sorry if any offence was caused, it wasn't intended. I had 'natsort' in the original code already, but will take a look at natsortfiles.

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Jan
Jan am 11 Mai 2017
Bearbeitet: Jan am 11 Mai 2017
C = strcat('HURRAH!! File',{''},B,' does exist.\n')
This creates a cell string. Then fprintf must fail, because it accepts strings only. Use this:
fprintf('HURRAH!! File %s does exist.\n', B);
This is safer, because the file name can contain control characters like '\n'.
Note:
natsort(theMATfiles)
is useless, because the output is not caught. Do you mean:
theMATfiles = natsort(theMATfiles);
Simplification:
d = dir;
d1=struct2cell(d);
d2=d1(1,:);
d3=cellfun(@(x) regexp(x,'.mat'),d2,'uni',false);
d4=find(~cellfun('isempty', d3));
Easier:
FileDir = dir('*.mat');
FileName = {FileDir.name};
  2 Kommentare
Stephen23
Stephen23 am 11 Mai 2017
Bearbeitet: Stephen23 am 18 Apr. 2021
And to provide the correct filename order:
S = dir('*.mat');
S = natsortfiles(S);
Stephen Devlin
Stephen Devlin am 12 Mai 2017
Thanks Jan and Stephen, very much appreciated, I had missed that fprintf will only accept a string.

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